Teh Answerz BAUS

An electron is accelerated through an electric potential to a kinetic energy of 18.9 keV or 3.02811351*10^-15 joules

What is its characteristic wavelength? [Hint: Recall that the kinetic energy of a moving object is E = (1/2)m(v^2)]

So i first tried solving the problem by solving for v: 3.02811351*10^-15 = (1/2)m(v^2) where m is the mass of an electron which is 9.11 x10^-31.

Then i used λ = hv/E to solve for λ where h is 6.626*10^-34 v is the velocity that i solved for an E is 3.02811351*10^-15 J

Is this the correct way because i got a wrong answer, what am i doing wrong? Thanks

The equilibrium constant Kc for C(s) + CO2(g) <-----> 2CO (g) is 1.9 at 1000K and .133 at 298K

1. If excess C is allowed to react with 26 g of CO2 in 3 L vessel at 1000K how many grams of CO are produced?

2.How many grams of C are consumed

Not sure where to start but i think le chatelier principle is applied somewhere? It be great if you showed me how you got to the answer

Using enthalpies of formation, calculate the quantity of heat produced when 4.35 g of butane is completely combusted in air under standard conditions.

butane is C4H10(L)

how do i use to formula for enthalpies of formation when they give me grams? Is it possible for you to show steps to how you got your answer? Thanks

Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.25 million metric tons. (A metric ton is 1000 kg.)

The enthalpy change for melting ice at 0 Celsius and constant atmospheric pressure is 6.01 kJ/mol

I don't even know where to start, help plz

The balanced equation is 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O. You have 12.5 g of C2H2 and 12.5 g of O2.

How many grams of O2 are present after the reaction is complete.

I found out that oxygen is the limiting reactant with about .390639 moles but how do i find how many grams of 02 is left over. Is it just 0 because all of the 02 have been reacted or is it more complicated then that?

1. If an automobile travels 235 mi with a gas mileage of 21.5 mi/gal, how many kilograms of CO2 are produced?

Assume that the gasoline is composed of octane, C8H18(l), whose density is 0.69 g/mL

2. Repeat the calculation for a truck that has a gas mileage of 4 mi/gal

a ladder 10 ft long leans against a vertical wall, if the bottom of the ladder slides away from the base of the wall at a speed of 2 ft/sec how fast is the angle between the ladder and the wall changing when the bottom of the ladder is 6 ft from the base of the wall

a simple truss is used to support 2 loads. the structure is composed of member abc and cd these two members are pinned together at point c and are pinned to thw wall at points a and d (d is at the top and a is on the bottom). loeads of 4000 lbs is applied at b and 2000 lb on c. the weight of the beam is negligible in this problem. calculate the reactive forces D, Dx, Dy, Ax, Ay

i need help finding the quantity of heat i know that Q = Mass * Specific heat * Change in temp

I'm given brass has a mass of 105 g and its specific heat is .377 (kJ/kg K). In order to find its change of temperature it was placed in boiling water for a minute and then was placed in cold water and the temperature was read. i then took final temp (object after being heated placed in cold water) - initial temp (the cold water without anything in it) to get the change in temp

question now is do i just do Q = .377 * 105 * the change temp or is there something more i have to do?

if not could you please show me what i have to do thanks

A stone was dropped of a cliff and hit the ground with a speed of 120 ft/sec. What is the height of the cliff?

I've using that acceleration is -9.8 and tried to find velocity and position functions but couldn't get the right answers which is 225 ft

What steps do i need to take to arrive at this answer?

A 3'' by 5'' card is being made into an open top box. What size squares should be removed from the corners to maximize the volume of the box.

The teacher said the answer was ( 8 - srqroot(19) ) / 6

I know that i have to maximum volume and i came up with a formula for volume which was (3 - 2x)(5 - 2X)x. Then simplified and did the derivative of that and solved for x but didn't get the right answer

If you could show how to get the answer that would be great

a crate open at the top has vertical sides, a square bottom and a volume of 4 cubic meters. If the crate has the least possible surface area, find its dimensions

What would i get if i sold:

Gamecube (A/V + power)

2 wired controllers

251 block memory card

6 games (2 are player's choice)

And do they take N64 stuff? i have 1 N64 (A/V + power), controller and 2 games

if a 30 kg child on a 4 meter long rope swing is pulled 45 degrees to the side and let go how fast will she go at the lowest point

i've find velocity to be about 7 but its not right i used mgh = (1/2)(m)(v^2)

the derivative of f(x) = ((X^4) / 3) - ((x^5) / 5) attains its maximum value at x = ?

not sure on how to find f' tried used quotient rule but i keep on geting 4/3 as my x value when the answer is 1, can someone show me what steps to take to find f' then do i use sign pattern anaylis to find where the maximum is at?

The radius of a circle is increasing at a nonzero rate and at a certain instant the rate of increase in the area of the circle is numerically equal to the rate of increase in its circumference at this instant the radius of the circle is?

for what value of k will x + (k / x) have a relative maximum for x = -2

Given the curve: x ^ 2 - xy + y ^ 2 = 9

At the point (0,3) find the rate of change in the slope of the curve with respect to x.

Given the function defined by f(x) = x ^ 3 - x ^ 2 - 4x +4:

The point (a, b) is on the graph of f and the line tangent to the graph at (a, b) passes through the point (0, -8) which is not on the graph of f. Find the values of a and b.

i have alrdy found f'(x) = 3x ^ 2 - 2x - 4